Process for the manufacture of aluminium nitrid.



OTTOKAR SERPEK, 0F PARIS, FRANCE,

ASSIGNOR 'ro soon i'rn GENERALE DES NITRURES, 0F PARIS, FRANCE.

rnocnss FOB. :rHE MAIITUFACTURE or ALUMINIUM urrmn.

N 0 Drawing.

, Specification of Letters Patent, t t Ap 21, 1914,

Application filed' May 7, 1912. Serial No. 695,722.

To all whom it may concern Be it known that I, OTTOKAR SERPEK, a subject of the Emperol of Austria-Hungary, and a resident of 12 Rue Roquepine, Paris, France, have invented a new and p useful Process for the Manufacture of Aluminium N itrid, of which the following is a specification.

It is known that the formation of aluminium nitrid by the action of a current of nitrogen upon avmixture of carbon and alumina at high temperature is facilitated when there are added to the bodies present certain metallic oxids or hydroxids. It is further known that this reaction is also facilitated when there is added to the nitrogen- I serving for the reaction a certain quantity of hydrogen in the free state. This hydrogen may be nominally free or may beobtained by the employment of substances, such as carbids or sulfids of hydrogen, capable of setting the hydrogen free under the conditions of operation. This being so, the present invention is based upon the following fact; it has been found that the simultaneous addition of hydrogen to the reacting nitrogen and of oxid,. hydroxids, metallic carbonates and even metals to the solid mixture of alumina and carbon, increases the fixation of nitrogen to an extentmuch greater than was to be anticipated. The efi'ect obtained owing to these combined additions is considerably greater than the sum of the reults obtained by each of the separate additions.

The following examples will demonstrate the fact:

Example I: A mixture of 10 parts of alumina and 2.5 parts of carbon was heated in a furnace for one hour at 1500 0., (a) in a current of gas containing 9 parts of nitrogen and 1 of hydrogen, (6) incurrent of nitrogen alone but with additlon of 1.5 parts of iron (mid to the mixture, 0) in a current of gas containing 9 parts of nitrogen and 1 part of hydrogen, and with addition of 1.5 parts of iron oxid to the mixture. In these three cases the following quantities of nitrogen were fixed: (a) 12.85% (b) 7.7% (c) 27.07%. In this reaction the added oxid is reduced to metal, which becomes the catalytic agent.

Example 211-: There was heated for one hour in a furnace at 1525 C. (a) a mixture containingvl 0 parts of alumina and 2.5 parts of carbon, in a current of gas containing 9 parts of nitrogen and 1 part of hydrogen, (b) a mixture containing 10 parts of a1u\ mina, 5 parts of carbon and 1.5 parts of manganese carbonate in a current of nitro gen alone, (c)v a mixture containing 10 parts of alumina, 5 parts of carbon and 1.5 parts of manganese carbonate in a current of gas containing 9 parts of nitrogen and 1 part of hydrogen.

The following quantities of nitrogen were fixed: (a) 15.27% 6) 6.1% (c) I claim A 1. The process for the manufacture of aluminium nitrid, consisting in heating at temperatures above approximately 1300.degrees G. a mixture of alumina-us material and carbon with a catalytic substance, in a current of-nitrogen with a proportion .of free hydrogen.

2. The process for the manufacture of aluminium nitrid, consisting in heating at temperatures above approximately 1300 degrees C. in a current of nitrogen with a proportion of free hydrogen a mixture of aluminous material and carbon with a catalytic substance producing a metal in the reaction.

Intestimony whereof, I have signed my name to this specification, in the of two subscribing witnesses.

QTTOKAR SERPEK.

Witnesses:

H. C. COKE, LE'oN PEILLET.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

'Washington, I). C.

PPGSPHCC 

